Unstained Natural Protein Standards for SDS-PAGE are blended to give uniform band intensities when stained with Coomassie Blue R-250 or zinc stains. Natural SDS-PAGE Standards are available in broad, low, high, and polypeptide molecular weight ranges, allowing calibration in almost any percentage gel.

Polypeptide SDS-PAGE Standards are for molecular weight determination of peptides and small proteins resolved on Tricine gels. Consisting of six polypeptides with molecular masses ranging from ~1.4 to ~26.6 kD, Polypeptide SDS-PAGE Standards stain uniformly with Coomassie Blue G-250 stain.

What is the education discount policy?

For more than 15 years, Bio-Rad has made science education a major priority. To support this effort, the company has implemented a discount policy that allows high school and college teaching laboratories to purchase kits, instruments, reagents, and other equipment at preferred prices.

How do I apply for the education discount?

If you are an educator at the high school or college level, visit our Education Discount Policy page to establish an education account number.

If you are placing an order, you may proceed with your order; the account price will be applied if it is lower than the list price. If the problem persists, please call customer service at
or send an email to